句子的意思是：你最好在售票处问问飞机什么时候起飞.题中用了强调句将when the plane is taking off提前.即 you'd better find out when the plane is taking off at the booking office.主句时态是一般现在时,说明飞机未起飞,因此选D.用现在进行时表示将来.
It is when the plane___that you'd better find out at the boo
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